Boxplot - Minimum number of observations

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Berk
Berk 2013-6-21
I am wondering how Matlab could plot a box-plot having both the box and the whiskers with a minimum of three observations.
Could someone please help me understand how it is possible to provide a five-number summary by using only three observations? Any published reference on this issue would be greatly appreciated.
Kind Regards,
Berk

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the cyclist
the cyclist 2013-6-21
You can define quantiles even with just two data points:
http://mathworld.wolfram.com/Quantile.html
That's not to say that it is statistically meaningful, but where does one draw the line on software deciding for you when to create what you ask it to created?
The exact description of what MATLAB does is well documented:
http://www.mathworks.com/help/stats/boxplot.html

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